Studies on Dual Phase Conducting Polyaniline Magnetic Micro and Nano composites

摘要

The conducting polymers are vital sources for fabrication of micro electronics chips, GMR sensors, membranes and flexible electrodes. Polyaniline is widely chosen for such products because of its conductivity range. This paper focuses on the studies of dual phase properties of Polyaniline (PANI) - Magnetic Iron Oxide (MIO) composites wherein MIO micro and nano particles were incorporated in polyaniline. This type of MIO-Polyaniline composites can enhance both conductive and magnetic property. Polyaniline was synthesized by redox polymerization technique with MIO both in micro and nano size by in-situ polymerization. The MIO content was maintained at 0.2 to 0.6 gm with respect to 4.6 gm of aniline in polymerization reaction. The composites were characterized by FTIR, UV, XRD, SEM and VSM and conductivity unit. The saturation magnetization of composites was 0.0057 emu/g for 0.6 MIO micro spheres and 1.5507 emu/g for 0.6 MIO nano spheres. The DC conductivity values for pure PANI are 2.06×10~(-2) S/cm, 5.13×10~(-3) S/cm for PANI-0.6 micro MIO and 1.13×10~(-3) S/cm for PANI-0.6 Nano MIO. Micro tubular structure was observed for PANI composite in SEM. It is evident that the electrical properties are altered significantly on tailoring MIO in microtubes and the magnetic property is altered by tuning the composition of MIO from micro to nano range. These composites will satisfy the properties for applications such as actuators, super capacitors, EMI shielding, Fuel cells and Sensors.